Disclaimer: I don't own Inuyasha or Bleach

~~Why? He knew.~~

Minutes. Hours. Days. Weeks. Months. Years. Decades...

An unknown amout of time passed in Hueco Mundo, and all the time Ulquiorra had to strengthen his defenses against his own instincts; but there were times he went out of his way to eliminate trash, throughly terrifying a vast number of Hollows into hiding or semi-suicide acts. Still, no matter how he rebelled, in the corner of his mind, a fact he detested, he knew his instincts would eventually take command if even for a second.

He was a Vasto Lorde, the highest etapa Hollow could get, his intellect was higher than the pathetic level of the trash in Hueco Mundo, and he was one of the strongest beings in Hueco Mundo, but he was still a Hollow regardless and a Hollow's instincts is greatly amplyfied in contrast to a Human, Shinigami or even a mere animal.

Ulquiorra still tried to find out why did the little Hollow, the only company he ever had in this Hollowed existence, had such an effect in his instincts. He once entertained the thought of his instincts wanting to use her as a substance, but that thought was squashed when his instincts rebelled rather violently against that notion, regardless of the normality of it. He was doubtful that she had any attack that caused such reactions, they were Hollows after all, and her unique abilities so far were the ability to fade out of everyone's perpetual vision and sensor zone.

It was uncharasteristic, utterly distasteful and startling, something which he loathed, but Ulquiorra accepted his instincts will always be puzzling whenever regarding the little Hollow,

Still, there was the question of the frustrating ache in his Hollow hole.

It couldn't be hunger or physical pains. Any poisons not of Vasto Lorde level had nil chance of affecting him given that his reiatsu would instantly burn through them, and he hadn't met a single Vasto Lorde even when he wasn't one himself. There was little to no chances he was injured in that place. There were no infections, no injuries or wounds; nothing and it irked him.

And that was the most frightening aspect of it all.

He was irked.

He should've felt nothing, he shouldn't have felt irked. For the longest time, his white armour always prevented him from feeling the sands or any natural damage. His mask prevented him from smelling or tasting anything. Ever since he first woke up as a Hollow, he felt no emotions, he could not feel physical touch, he couldn't smell or eat; touch, smell or taste were barred from him. And obviously, emotions were too. Only his eyes gave him a gateway to the world of white sands and black sky, they showed him Hollows existed and Hueco Mundo's places, his eyes always saw everything; thus everything he could not see had no place in his vocabulary and therefore didn't exist.

He couldn't see emotions, didn't felt them or paid any mind; they didn't exist in return.

Thus it was a frightening aspect, to feel something after representing emptiness for decades or centuries.

It was a startling change in his world of emptiness and nihilism.

And he didn't like the way it jarred his world with unknown waves.

Not at all.

But while he didn't know those unknown emotions, he knew the cause of it.

Everything and nothing started with that cause, though he wasn't sure when, he knew.

He knew the white little Hollow was the cause of his sudden and unwelcome ability to feel the slightest emotions.

Yet again, he wondered if he should have eliminated her the moment he saw her.

And yet again, he brutally squashed down his instincts which violently reared up their heads.

The ache in his Hollow hole was still irritating.